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Short-Term Borrowings - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Short-term Debt [Line Items] |  |
Money Pledged as Collateral for FHLB Advance Borrowings | $ 25 | $ 25
FHLB Advances |  |
Short-term Debt [Line Items] |  |
Commercial real estate and residential mortgage loans pledged under blanket agreement | $ 1,789 | $ 1,909

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- Definition Commercial real estate and residential mortgage loans pledged under blanket agreement. + References No definition available. + Details
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Balance Type: | debit
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- Definition Money Pledged as Collateral for FHLB Advance Borrowings + References No definition available. + Details
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Namespace Prefix: | prk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |